Coil device

1. A first coil device that faces a second coil device in a first direction and wirelessly performs power transmission or power reception, the first coil device comprising: a first coil portion that faces a second coil portion of the second coil device in the first direction and includes a conductive wire; at least one nonmagnetic member that includes a protrusion protruding to an outside of the first coil portion in a second direction orthogonal to the first direction; the nonmagnetic member includes an eddy current interrupter that interrupts a part of an eddy current generated in the nonmagnetic member; the nonmagnetic member includes a hollow portion recessed to an opposite side from a side facing the second coil portion in the first direction such that the protrusion extends from within the recessed hollow portion, down a side wall defining the recess of the hollow portion and outward from the recessed hollow Portion in the second direction; the protrusion having a discontinuous portion in a portion of the protrusion extending down the side wall such that the hollow portion is disconnected from a portion of the protrusion that extends outward from the recessed hollow portion in the second direction; and the first coil portion is located within the hollow portion.

2. The first coil device according to claim 1 , wherein the eddy current interrupter is provided in the protrusion.

3. The first coil device according to claim 1 , wherein the first coil portion and the second coil portion are circular type coils.

4. The first coil device according to claim 1 , wherein the eddy current interrupter is a hole penetrating the nonmagnetic member in the first direction or a concave portion recessed in the first direction.

5. The first coil device according to claim 1 wherein an eddy current interrupter is not included in non-protrusion portions of the nonmagnetic member.